206 THE JOURNAL OF GEOLOGY. 



imperfectly the nature of the trench and the location of the rock 

 summit in its buried floor, he is liable to mistake this obscured 

 rock summit for a true col. It is, in fact, not a col at all in any 

 proper sense. It never has been a watershed, and has never 

 performed the functions or sustained the relations of a true col. 

 As there is frequent occasion to refer to this phenomenon in the 

 discussion of certain regions of reversed drainage along the 

 border of the ancient glacial formations, I propose for it the 

 distinctive name pseudo-col. The nature of the phenomenon has 

 been more or less distinctly recognized by many geologists. 

 The purpose of this note is merely to bring it forth into more 

 definite recognition and to supply it with a convenient name 

 which may be used in lieu of the cumbersome periphrastic 

 phraseology now required. 



T. C. Chamberlin. 



NOTE ON THE ENGLISH EQUIVALENT OF 

 SCHUPPENSTRUKTUR. 



In a paper entitled "On the geological structure of the 

 Housatonic valley lying east of Mt. Washington " (Journal of 

 Geology, Vol. I. No. 8), I proposed the term (p. 791) weather- 

 board structure as an equivalent of Suess's term Schuppejistruktur 

 to describe a structure caused by a series of small compressed 

 overfolds finding relief through dislocation, and resulting in the 

 production of a parallel series of overlapping plates. Mr. Ber- 

 nard Hobson, of Manchester,- England, has suggested to me that 

 the term imbricate structure would be better because of its Latin 

 derivation and its use in botanical literature. The two terms are 

 practically identical as regards the idea conveyed, and though 

 the term first suggested would perhaps give a better mental 

 picture to many minds, Mr. Hobson's term would be more read- 

 ily understood abroad, and has the added advantage of being 

 the English equivalent of Margerie's structure imbrique. I should 

 therefore be glad to see imbricate structure adopted rather than 

 the term which I at first suggested. 



William H. Hobbs. 



